Physics
Fluid-Mechanics
Easy
Question
A cylinder containing water up to a height of 25 cm has a hole of cross-section 
in its bottom. It is counterpoised in a balance. What is the initial change in the balancing weight when water begins to flow out?
- Increase of 12.5 qwt
- Increase of 6.25 gwt
- Decrease of 12.5 gwt
- Decrease of 6.25 gwt
The correct answer is: Decrease of 12.5 gwt
Let A = The area of cross section of the hole
v = Initial velocity of efflux
d = Density of water
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